Custom fields on Material Master - ECC6.0

Hello

We have added custom fields on material master basic data screen following these steps :

1) Copied Func. grp MGD1 to Z Fgrp via Spro -> Logistics General ..

2) Created a subscreen in Z fungrp by copying screen from original program.

3) Deleted the unwanted fields and added new fields to the layout and Fields in PAI.

4) Attached the subscreen in screen sequuence via SPRO

We are now able to see the new fields on the baisc data screen and also able to input data in these fields , but on SAVE the data is not getting saved to database table MARA.

We have also referred to OSS note 44410 but with no help.

Are we missing something , is there anything additional that needs to be done in ECC6.0 ?

Thanks